Construction has never been easier - or safer! These fun-filled sets are composed of large magnetic pieces, so assembly is a snap! Basic pieces include colorful bars (in a couple of different lengths - long bars are almost 5" in length) and large metal balls (1.8" in diameter), with a variety of specialized pieces (wheels, containers, cabs, panels, etc.) in different sets. While each set is self-contained with all the pieces necessary for its purpose, the pieces are also interchangeable with the other sets. All the pieces are very durable and adhere to the strictest safety regulations. See below for the set that is perfect for you!